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DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMITSUBISHI2009LANCER L4-2.4L (4B12)REPAIR AND DIAGNOSISBODY AND FRAMEBODY CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESWIRELESS CONTROL MODULE (WCM)INSPECTION PROCEDURE 3
2009 Mitsubishi Lancer L4-2.4L (4B12)
Inspection Procedure 3
2009 Mitsubishi Lancer L4-2.4L (4B12)SECTION Inspection Procedure 3
Inspection Procedure 3: Engine does not start.
TECHNICAL DESCRIPTION (COMMENT)
If the fuel injection does not work, WCM and the MFI system may have a problem. This symptom is not considered abnormal when the engine is started by an ignition key that has not been registered.
TROUBLESHOOTING HINTS
- Malfunction of battery
- Malfunction of the MFI system
- Malfunction of WCM
- Malfunction of CAN bus line
- Malfunction of the transponder
- VIN not programmed
DIAGNOSIS
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
STEP 1. Check the battery voltage.
Measure the battery voltage when cranking.
- The voltage should measure 8 volt or more.
Q: Is the measured voltage 8 volt or more?
YES: Go to Step 2.
NO: Check the battery. (Refer to Battery test) Testing and Inspection
STEP 2. Using scan tool MB991958, diagnose the CAN bus line.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III)". How To Connect The Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES: Go to Step 3.
NO: Repair the CAN bus line.
STEP 3. Using scan tool MB991958, read the MFI system diagnostic trouble code.
Check if DTC is set to the engine control module.
Q: Is the DTC set?
YES: Troubleshoot the MFI system. (Refer to Diagnostic trouble code chart Diagnostic Trouble Code Descriptions
NO: Go to Step 4.
STEP 4. Using scan tool MB991958, read the WCM diagnostic trouble code.
Check if DTC is set to the WCM.
Q: Is the DTC set?
YES: Troubleshoot the WCM. Diagnostic Trouble Code Descriptions
NO: Go to Step 5.
STEP 5. Check that the engine starts.
Q: Does the engine start?
YES: The procedure is complete.
NO: Refer to Diagnostic trouble code chart Diagnostic Trouble Code Descriptions. When the cause of the failure cannot be tracked down by the troubleshooting in [2.0L Engine Non-turbo], [2.0L Engine Turbo] or [2.4L Engine], replace WCM and register the ID codes.
TECHNICAL DESCRIPTION (COMMENT)
If the fuel injection does not work, WCM and the MFI system may have a problem. This symptom is not considered abnormal when the engine is started by an ignition key that has not been registered.
TROUBLESHOOTING HINTS
- Malfunction of battery
- Malfunction of the MFI system
- Malfunction of WCM
- Malfunction of CAN bus line
- Malfunction of the transponder
- VIN not programmed
DIAGNOSIS
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
STEP 1. Check the battery voltage.
Measure the battery voltage when cranking.
- The voltage should measure 8 volt or more.
Q: Is the measured voltage 8 volt or more?
YES: Go to Step 2.
NO: Check the battery. (Refer to Battery test) Testing and Inspection
STEP 2. Using scan tool MB991958, diagnose the CAN bus line.
CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
1. Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III)". How To Connect The Scan Tool (M.U.T.-III)
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES: Go to Step 3.
NO: Repair the CAN bus line.
STEP 3. Using scan tool MB991958, read the MFI system diagnostic trouble code.
Check if DTC is set to the engine control module.
Q: Is the DTC set?
YES: Troubleshoot the MFI system. (Refer to Diagnostic trouble code chart Diagnostic Trouble Code Descriptions
NO: Go to Step 4.
STEP 4. Using scan tool MB991958, read the WCM diagnostic trouble code.
Check if DTC is set to the WCM.
Q: Is the DTC set?
YES: Troubleshoot the WCM. Diagnostic Trouble Code Descriptions
NO: Go to Step 5.
STEP 5. Check that the engine starts.
Q: Does the engine start?
YES: The procedure is complete.
NO: Refer to Diagnostic trouble code chart Diagnostic Trouble Code Descriptions. When the cause of the failure cannot be tracked down by the troubleshooting in [2.0L Engine Non-turbo], [2.0L Engine Turbo] or [2.4L Engine], replace WCM and register the ID codes.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.